The command lines for the compilation are getting quite long with all the modules listed on the command line.
An alternate solution would be to introduce a build-time generated header that will contain defines for all enabled modules and other defines currently given on the command line. The drawback is that this configuration header must be included by all headers and c files in the tree..

We can actually implement it using the -include GCC command line option.

something like $(BINDIR)/riot-build.h:

#define COREIF_NG 1
#define CPU_ARCH_CORTEX_M4
#define CPU_MODEL_K60DN512VLL10
#define RIOT_BOARD BOARD_MULLE
...
#define MODULE_AT86RF212B
#define MODULE_AT86RF2XX
#define MODULE_GNRC_NETAPI
...